ecological classification of fresh water
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Ecological Classification of Fresh water
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Organisms in Fresh water (or any other natural habitat) are not arranged in taxonomic order (such as is followed in taxonomic text or systematic museum) some sort of classification on an ecological basis is useful
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Autotrophs (producers)
are green plants and chemosynthetic microorganism.
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Phagotrophs (Macroconsumer)
primary, secondary, etc, herbivores, predators, parasites
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Saprotrophs (microconsumer or decomposers)
Subclassified according to nature of the organic substrate decomposed
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Organisn in water may be classified as to their life form or life habitat, base on their
mode of life.
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Benthos
Organism attached or resting on the bottom or living in the bottom sediments
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Periphyton or Aufwuchs
Organisms (both plant and animal) attached or clinging to stems
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Plankton Floating organisms whose movements are more or less dependent on current. While some of the zooplankton exhibit active swimming movements that aid in the maintaining vertical position plankton as a whole is unable to move againts appreciable currents.
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Nekton
Swimming organisms that able to navigate at will(and hence capable of avoiding plankton, nets, water bottles etc.) Fish amphibians, large swimming insects and so fourth.
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Neuston
Organism resting or swimming on the surface.
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Finally, organism may be classified as to region or
subhabitat. In the ponds and lakes three zones are generally
evident
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Littoral Zone The shallow water region with light penetration to the bottom typically occupied by rooted plants in natural ponds and lakes but not necessarily.
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Limnetic Zone
The open water zone to the depht of effective light penatration, called the compensation level which is the depth at which photosynthesis just balances respiration.
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Profundal Zone
The bottom and deep water area which is beyond the depth of effective light penetration. This zone is often absent in ponds.
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Rapid Zone
Shallow water where velocity of current is great enough to keep the bottom clear of silt and other loose materials, thus providing a firm substrate.
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Pool Zone
Deeper water where velocity of current is reduced and silt and other loose materials o be tend to settle to the bottom, thus provide a soft bottom.
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The Fresh Water Biota The major Divisions of plants and many of the major animal phyla are represented by one or more genera living in fresh water communities.
LENTIC COMMUNITIES The biological characteristics of still water bodies.NATURE AND COMMUNITIES IN THE LITTORAL ZONE Producers Consumers
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The Limnetic Zone
The limnetic zone is the well it, open surface waters in a lake, away from the shore. The vegetation of the littoral zone surrounds this expance of open water and its above the profundal zone.
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THE ENDTHANK YOU